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Thanks for the suggestion. Here is the information plate: The manual is brief about pump speed.

It's a vaillant ecotec combi boiler, so I don't think I can adjust the pump speed? Or am I wrong? Does the system balancing cause noise? As I said the noises were there before I turned any of the lock shields. And the system wasn't balanced before either, I think the heating is much more even now..

Thanks - definitely on the feed side, it's much hotter on the side with the valve

Hi all, we recently had new radiators with new TRVs fitted. The new radiators are in different positions and the water is piped to the new positions with 15mm plastic pipes (the existing pipework is copper). Some of the new TRVs whistle when closing / opening. When fully open (or fully closed...